Solar cell and method for manufacturing the same, and solar cell module

Abstract

A solar cell module includes a plurality of solar cells comprising a first solar cell and a second solar cell adjacent to each other, a conductive ribbon electrically connecting the first solar cell and the second solar cell, a front member positioned on a front surface of the plurality of solar cells, a back member positioned on a back surface of the plurality of solar cells, a first protection film positioned between the front member and the plurality of solar cells, and a second protection film positioned between the back member and the plurality of solar cells.

What is claimed is: 
     
         1 . A solar cell module, comprising:
 a plurality of solar cells comprising a first solar cell and a second solar cell adjacent to each other;   a conductive ribbon electrically connecting the first solar cell and the second solar cell;   a front member positioned on a front surface of the plurality of solar cells;   a back member positioned on a back surface of the plurality of solar cells;   a first protection film positioned between the front member and the plurality of solar cells; and   a second protection film positioned between the back member and the plurality of solar cells,   wherein each of the plurality of solar cells comprises:
 a substrate of a first conductive type; 
 a plurality of first finger electrodes formed in a first direction, each first finger electrode being positioned on a first surface of the substrate; and 
 at least one first collector formed in a direction crossing the first direction on the first surface of the substrate, 
   wherein the conductive ribbon is attached to the at least one first collector in a second direction by a conductive adhesive,   wherein the conductive ribbon has a width greater than a width of the at least on first collector, and   wherein the conductive ribbon includes:
 a first region corresponding to the plurality of first finger electrodes and the at least one first collector and connected to the plurality of first finger electrodes and the at least one first collector by the conductive adhesive; and 
 a second region corresponding to a portion where the plurality of first finger electrodes and the at least one first collector are not formed and connected to the portion where the plurality of first finger electrodes and the at least one first collector are not formed by the conductive adhesive. 
   
     
     
         2 . The solar cell module of  claim 1 , wherein the conductive adhesive is in contact with the first region and the plurality of first finger electrodes and the at least one first collector between the first region and the plurality of first finger electrodes and the at least one first collector and is in contact with the second region and the portion where the plurality of first finger electrodes and the at least one first collector are not formed between the second region and the portion where the plurality of first finger electrodes and the at least one first collector are not formed. 
     
     
         3 . The solar cell module of  claim 1 , wherein, in the first direction, the conductive ribbon overlaps an entire portion of the at least one first collector. 
     
     
         4 . The solar cell module of  claim 1 , wherein each of the plurality of solar cells further comprises an anti-reflection layer on the substrate, and
 wherein the second region of the conductive ribbon is formed on the anti-reflection layer at the portion where the plurality of first finger electrodes and the at least one first collector are not formed.   
     
     
         5 . The solar cell module of  claim 1 , wherein the at least one first collector comprises:
 a plurality of first collecting portions connected to the plurality of first finger electrodes and formed in the first direction to be parallel to each other with an interval; and   a second collecting portion, and   wherein the second collecting portion comprises:
 a first portion extended in a third direction from a first intersection with a first one of the plurality of first collecting portions and a second intersection with a second one of the plurality of first collecting portions; and 
 a second portion extended in a fourth direction from the second intersection to a third intersection with a third one of the plurality of first collecting portions. 
   
     
     
         6 . The solar cell module of  claim 5 , wherein the first portion and the second portion are symmetrical with each other with respect to the second one of the plurality of first collecting portions. 
     
     
         7 . The solar cell module of  claim 5 , wherein the first portion comprises a plurality of first portions and the second portion comprises a plurality of second portions, and
 the plurality of first portions and the plurality of second portions are alternatively arranged in the second direction.   
     
     
         8 . The solar cell module of  claim 7 , wherein the second collecting portion has a zigzag shape or a corrugated shape. 
     
     
         9 . The solar cell module of  claim 5 , wherein one side of the second collecting portion is connected to one of the plurality of first finger electrodes and the other side of the second collecting portion is connected to one of the plurality of first collecting portions. 
     
     
         10 . The solar cell module of  claim 1 , wherein each of the plurality of solar cells further comprises:
 an emitter layer of a second conductive type, which is opposite to the first conductive type, positioned on the first surface of the substrate,   wherein each of the plurality of solar cells further comprises an anti-reflection layer on the emitter layer,   wherein the anti-reflection layer has openings, and   where the plurality of first finger electrodes and the at least one first collector are connected to the emitter layer through the openings of the anti-reflection layer.   
     
     
         11 . The solar cell module of  claim 1 , wherein the at least one first collector comprises three first collectors on the front surface of each of the plurality of solar cells, and
 the conductive ribbon comprises three conductive ribbons connected to the three first collectors, respectively, on the front surface of each of the plurality of solar cells.   
     
     
         12 . The solar cell module of  claim 5 , wherein the first region of the conductive ribbon overlaps the plurality of first collecting portions and the second collecting portion. 
     
     
         13 . The solar cell module of  claim 5 , wherein each of the plurality of first finger electrodes, the plurality of first collecting portions, and the second collecting portion comprises silver (Ag). 
     
     
         14 . The solar cell module of  claim 1 , wherein each of the plurality of solar cells further comprises:
 at least one second collector formed in a direction crossing the first direction on a second surface of the substrate.   
     
     
         15 . The solar cell module of  claim 14 , wherein the at least one second collector has a zigzag shape or a corrugated shape. 
     
     
         16 . The solar cell module of  claim 15 , wherein the at least one second collector comprises three second collectors on the back surface of each of the plurality of solar cells, and
 the solar cell module comprise three conductive ribbons connected to the three second collectors, respectively, on the back surface of each of the plurality of solar cells.   
     
     
         17 . The solar cell module of  claim 1 , wherein the front member comprises a transparent material;
 wherein the front member comprises glass;   wherein the back member comprises a back sheet; or   wherein the first protection film or the second protection film comprises at least one of ethylene vinyl acetate (EVA), polyvinyl butyral, ethylene vinyl acetate partial oxide, a silicon resin, an ester-based resin, and an olefin-based resin.   
     
     
         18 . The solar cell module of  claim 1 , wherein each of the plurality of solar cells further comprises a second electrode formed on a second surface of the substrate, and
 wherein an area of the second electrode is greater than an area of the plurality of first finger electrodes.   
     
     
         19 . The solar cell module of  claim 1 , wherein the second collecting portion electrically connects the plurality of first collecting portions. 
     
     
         20 . The solar cell module of  claim 1 , wherein the first intersection is positioned at one end of the first one of the plurality of first collecting portions and the second intersection is positioned at the other end of the second one of the plurality of first collecting portions, and
 wherein one of the plurality of first collecting portions and the one of the plurality of first fingers meet each other at the first intersection or the second intersection.